Minnesota Department of Transportation

511 Travel Info

Technical Certification Program

Print or download the listed course materials, and bring them to class.

Grading and Base Inspector Certification (GBIC)

Prerequisites for certification

  • You must be certified in Aggregate Production Tester (APTC) and Grading and Base Tester (GBTC) before this certification will be awarded to you.
  • We highly recommend you take the courses in this order: APTC, GBTC.

Expiration and recertification options

  • This certification expires after five seasons.
  • A recertification must be completed before the end of the fifth training season.
  • If your certification has recently expired and you have relevant work experience, you may apply to regain MnDOT certification through a Recently Expired Certification Exam. Otherwise, you must take the initial certification course again to regain certification.

Class logistics

  • Learning mode: In person
  • If you need to register: Learn about the certification process and then register for the class.
  • Logistics: See the Registration Confirmation and Class Reminder emails from Lake Superior College for class dates, time, location, and directions. Time will be provided for on- or off-site lunch. No meals or beverages will be provided.
  • Learning differences and accommodations: If you have a disability or learning issue, either permanent or temporary, which might affect your ability to perform in a class, the online exam, or the performance exam, contact Suzanne Johnsrud, 218-428-1002, to discuss possible accommodations.
  • Summary: GBI Certification Summary (PDF)
  • Professional development hours (PDHs): 18
  • Lake Superior College course credits possible: 2 (you must complete an LSC course credit form)

What to bring to class

Print and bring to class 

Print and bring to class (or download the files on a laptop or tablet you're bringing)

Reference books/manuals to bring (hard copy or electronic)  

  • None

Also bring to class

  • Calculator
  • Paper, pencil or pen, highlighter, and tabs or sticky notes
  • Laptop/tablet (recommended)
  • Face mask (for health and safety, if needed)
  • Lunch, snacks, and beverages to eat/drink if you plan to eat on-site  

About the certification exams

Written exam process

  • You will have 120 minutes to complete the 50 question written exam online.
  • You must score 70% or higher to pass; if you score 60-69%, you may request a retest.
  • The exam will open for you at the end of the last day of class.
  • You must complete the exam within one week after it is open for you, meaning the same day the following week.
  • Find your exam to take it when it is open for you.

Written exam topics (approximate percentage of exam)

  • MnDOT Specifications 35%
  • Soils Properties and Soils Classification 20%
  • Duties of the Inspector 20%
  • Pavement Reclamation 10%
  • Geosynthetics and Soil Reinforcement 10%
  • Project Documentation and Closeout 5%

Materials allowed during the written exam

This is an open book exam. You may use the training manual and all other course materials during the exam. A calculator is provided within the online exam.

Performance exam

  • None